[Cluster-devel] [PATCH 02/51] [GFS2] Fix calculation of demote state

[swhiteho at redhat.com]

From: Josef Whiter <jwhiter at redhat.com>

If a glock is in the exclusive state and a request for demote to
deferred has been received, then further requests for demote to
shared are being ignored. This patch fixes that by ensuring that
we demote to unlocked in that case.

Signed-off-by: Josef Whiter <jwhiter at redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho at redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 6a3eeba..6b6ae45 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -697,8 +697,9 @@ static void handle_callback(struct gfs2_glock *gl, unsigned int state, int remot
 			}
 			return;
 		}
-	} else if (gl->gl_demote_state != LM_ST_UNLOCKED) {
-		gl->gl_demote_state = state;
+	} else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
+			gl->gl_demote_state != state) {
+		gl->gl_demote_state = LM_ST_UNLOCKED;
 	}
 	spin_unlock(&gl->gl_spin);
 }
-- 
1.5.1.2